Pictures, such as Kingdom Hearts characters from the past 15 years were also exhibited. Check it out below. This will be exhibited as a mural painting.

There is also a Twitter campaign related to the memorial clock. The campaign invites people to take pictures in person with the memorial clock or to use one of the prepared stained glass images given on the official site with the hashtag #キングダムハーツ15周年.

All promotional images including the poster for the Twitter campaign can be found below thanks to 4Gamer.

UPDATE 1: The Kingdom Hearts Memorial Clock is now set up and open to the public! The website has also been updated to include a virtual version of the clock featuring all the games in the Kingdom Hearts series with short video clips and images. They've also added a link to easily participate in the previously mentioned Twitter campaign if you cannot make it to the Memorial Clock in person. A video and image of the Memorial Clock have been provided thanks to Twitter user @pi_su05 and more images of the display have been provided thanks to Twitter users @mti_k_h, @Soichiro_Sun, @Jixon_Livermore, and @adachi813! Thank you to Churro and KH Destiny for the tips!

For the game player, the Final Fantasy characters are their childhood friends, but that's not the same for the Kingdom Hearts characters we introduced. They're original in their birth and ages, and we introduced them with a different goal in mind. I think that the individuality of these characters and meeting them is one adventure to look forward to.

--Kingdom Hearts Series Director, Nomura Tetsuya

We received a feeling of exhilaration with a simple creation. We've been working on this concept for a long time. Even for people who aren't good at games, just by touching it, you can run around as you please, and you can bring forth flashy, beautiful effects like falling branches. The battles tend to be brutal, but I think the item that will help you avoid feeling that is the Keyblade.

--Kingdom Hearts Series Director, Nomura Tetsuya

Even if you try to live a just life these days, just by that you'll wear yourself out. The feeling of leaving the road you should travel on is a strangely sweet one. I think that's the kind of existence they have.

--Kingdom Hearts Series Director, Nomura Tetsuya

I say that “Sora is a normal boy,” but there are surely people who feel uneasy about that statement. He holds many hearts inside of him and continues adventures through a dream-like world--how is that “normal”? By putting it simply, surely everyone lives while feeling the emotions in someone else's heart, and they should all be on their own adventure. With that in mind, Sora is just like any other boy. From here on, just like everyone else, Sora will have many experiences, and as he experiences empathy he surely will grow, but I think he will remain a normal boy in everyone's hearts.

--Kingdom Hearts Series Director, Nomura Tetsuya

UPDATE 3: Famitsu has reported that the Kingdom Hearts Memorial Clock exhibit has 5 themes: "Sora's memories", "Ones who doesn't exist", "Keyblade", "Final Fantasy", and "The World of Kingdom Hearts".

That's two Chain of Memories ones, two DDD ones, two Days ones, one for coded, one for khux/khx, and two BBS ones. Are they actually acknowledging the games that aren't KH1 and KH2 in this stuff now?? I'm glad. And wow Xion's and Aqua's are so pretty.

Rob loves how Aqua is in the middle in the character chart with Sora next to her. Rob loves Aqua's stained glass. Rob loves how Sora's stained glass points to Aqua. Rob loves how Aqua is the most most focused in the countdown screen.

The fact that a huge part of Sora's arc is learning empathy is. So good. KH2 REALLY stepped out on that one by not having Sora question himself on Nobodies even after Axel dies for him/Roxas, but DDD managed to come back to that in an amazing way, and I can't wait to see Sora keep growing like that. I feel like it has to be a huge part of his arc in KH3, considering following his heart brought him to darkness in DDD but Data-Ansem says he needs to follow his heart in order to save the people who need him.